ERROR_IPSEC_IKE_MM_LIMIT (13882) - Windows Error Code Reference

Technical Background

The ERROR_IPSEC_IKE_MM_LIMIT error code indicates that the maximum number of established Main Mode Security Associations (MM SAs) to a peer has been exceeded. This is a specific technical mechanism within the Windows implementation of Internet Protocol Security (IPsec).

Error Details

Error Name: ERROR_IPSEC_IKE_MM_LIMIT
Numeric Code: 13882
Hex Code: 0x363A
Short Description: Max number of established MM SAs to peer exceeded.

Common Causes

This error typically occurs when the system has reached its configured limit for establishing Main Mode Security Associations with a specific peer. The limit is set by the operating system and can be adjusted through Group Policy or registry settings.

Real-World Context

IPsec uses Security Associations (SAs) to establish secure connections between peers. Main Mode SAs are used in the initial phase of IPsec negotiation, where the two parties exchange keying material and other necessary information before transitioning to Quick Mode SAs for ongoing data protection.

Is This Error Critical?

The criticality of this error depends on the specific context in which it occurs. If the system is unable to establish a new MM SA due to reaching its limit, it may impact the ability to initiate secure communications with that peer. However, existing connections should remain unaffected as long as Quick Mode SAs are still available.

How to Diagnose

Review Operation Context: Check if there are any recent changes in network configuration or security policies that might have altered the limit for MM SAs.
Validate Parameters: Ensure that no invalid parameters were passed during the IPsec negotiation process, such as incorrect peer addresses or security protocols.
Confirm Object Types: Verify that the objects involved (e.g., IPsec policies) are correctly configured and do not exceed any defined limits.
Verify Input Data: Confirm that all input data is valid and does not contain corrupted information that could affect SA establishment.

How to Resolve

Correct Parameter Usage: Ensure that all parameters used in the IPsec configuration are correct and within acceptable ranges.
Adjust Operation Context: If the limit has been reached due to a high number of active connections, consider temporarily reducing the number of concurrent connections or increasing the configured limit through Group Policy or registry settings.
Restore Data: If data corruption is suspected, restore from a known good backup and reconfigure IPsec policies as necessary.
Retry Operation with Valid Inputs: Attempt to establish the connection again using valid inputs and ensure that all prerequisites are met before initiating the negotiation process.

Developer Notes

Developers should be aware of the potential impact of this error on network performance and security. Proper configuration and monitoring of IPsec policies can help mitigate issues related to SA limits.

Related Errors

ERROR_IPSEC_IKE_QM_LIMIT: Exceeded maximum number of established Quick Mode SAs to peer.
ERROR_IPSEC_MM_SA_REKEY_FAILED: Main Mode Security Association rekeying failed due to resource constraints.

FAQ

Q: What does the ERROR_IPSEC_IKE_MM_LIMIT error mean?

A: This error indicates that the system has reached its limit for establishing Main Mode Security Associations with a specific peer, preventing new connections from being established.

Q: How can I resolve this issue?

A: You may need to adjust the IPsec policy settings or reduce the number of concurrent connections. Additionally, ensure all parameters and input data are correct and valid.

Summary

The ERROR_IPSEC_IKE_MM_LIMIT error is a specific technical mechanism indicating that the maximum number of established Main Mode Security Associations has been reached for a peer. Understanding its context and implications can help in diagnosing and resolving issues related to IPsec configuration and performance.